Annotation of src/usr.bin/tmux/screen.c, Revision 1.47
1.47 ! nicm 1: /* $OpenBSD: screen.c,v 1.46 2017/02/08 16:45:18 nicm Exp $ */
1.1 nicm 2:
3: /*
1.37 nicm 4: * Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.com>
1.1 nicm 5: *
6: * Permission to use, copy, modify, and distribute this software for any
7: * purpose with or without fee is hereby granted, provided that the above
8: * copyright notice and this permission notice appear in all copies.
9: *
10: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14: * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
15: * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
16: * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17: */
18:
19: #include <sys/types.h>
20:
1.3 nicm 21: #include <stdlib.h>
1.1 nicm 22: #include <string.h>
1.16 nicm 23: #include <unistd.h>
1.47 ! nicm 24: #include <vis.h>
1.1 nicm 25:
26: #include "tmux.h"
27:
1.41 nicm 28: static void screen_resize_x(struct screen *, u_int);
29: static void screen_resize_y(struct screen *, u_int);
1.1 nicm 30:
1.42 nicm 31: static void screen_reflow(struct screen *, u_int);
32:
1.1 nicm 33: /* Create a new screen. */
34: void
35: screen_init(struct screen *s, u_int sx, u_int sy, u_int hlimit)
36: {
37: s->grid = grid_create(sx, sy, hlimit);
1.34 nicm 38: s->title = xstrdup("");
1.1 nicm 39:
1.21 nicm 40: s->cstyle = 0;
1.20 nicm 41: s->ccolour = xstrdup("");
1.3 nicm 42: s->tabs = NULL;
43:
1.1 nicm 44: screen_reinit(s);
45: }
46:
47: /* Reinitialise screen. */
48: void
49: screen_reinit(struct screen *s)
50: {
51: s->cx = 0;
52: s->cy = 0;
53:
54: s->rupper = 0;
55: s->rlower = screen_size_y(s) - 1;
56:
1.16 nicm 57: s->mode = MODE_CURSOR | MODE_WRAP;
1.12 nicm 58:
1.3 nicm 59: screen_reset_tabs(s);
1.1 nicm 60:
1.44 nicm 61: grid_clear_lines(s->grid, s->grid->hsize, s->grid->sy, 8);
1.1 nicm 62:
63: screen_clear_selection(s);
64: }
65:
66: /* Destroy a screen. */
67: void
68: screen_free(struct screen *s)
69: {
1.23 nicm 70: free(s->tabs);
71: free(s->title);
72: free(s->ccolour);
1.1 nicm 73: grid_destroy(s->grid);
74: }
75:
1.3 nicm 76: /* Reset tabs to default, eight spaces apart. */
77: void
78: screen_reset_tabs(struct screen *s)
79: {
80: u_int i;
81:
1.23 nicm 82: free(s->tabs);
1.3 nicm 83:
84: if ((s->tabs = bit_alloc(screen_size_x(s))) == NULL)
85: fatal("bit_alloc failed");
86: for (i = 8; i < screen_size_x(s); i += 8)
87: bit_set(s->tabs, i);
1.21 nicm 88: }
89:
90: /* Set screen cursor style. */
91: void
92: screen_set_cursor_style(struct screen *s, u_int style)
93: {
1.22 nicm 94: if (style <= 6)
1.21 nicm 95: s->cstyle = style;
1.20 nicm 96: }
97:
98: /* Set screen cursor colour. */
99: void
1.36 nicm 100: screen_set_cursor_colour(struct screen *s, const char *colour)
1.20 nicm 101: {
1.23 nicm 102: free(s->ccolour);
1.36 nicm 103: s->ccolour = xstrdup(colour);
1.3 nicm 104: }
105:
1.1 nicm 106: /* Set screen title. */
107: void
108: screen_set_title(struct screen *s, const char *title)
109: {
1.23 nicm 110: free(s->title);
1.47 ! nicm 111: utf8_stravis(&s->title, title, VIS_OCTAL|VIS_CSTYLE|VIS_TAB|VIS_NL);
1.1 nicm 112: }
113:
114: /* Resize screen. */
115: void
1.24 nicm 116: screen_resize(struct screen *s, u_int sx, u_int sy, int reflow)
1.1 nicm 117: {
118: if (sx < 1)
119: sx = 1;
120: if (sy < 1)
121: sy = 1;
122:
1.3 nicm 123: if (sx != screen_size_x(s)) {
1.1 nicm 124: screen_resize_x(s, sx);
1.3 nicm 125:
126: /*
127: * It is unclear what should happen to tabs on resize. xterm
128: * seems to try and maintain them, rxvt resets them. Resetting
129: * is simpler and more reliable so let's do that.
130: */
131: screen_reset_tabs(s);
132: }
133:
1.1 nicm 134: if (sy != screen_size_y(s))
135: screen_resize_y(s, sy);
1.24 nicm 136:
137: if (reflow)
138: screen_reflow(s, sx);
1.1 nicm 139: }
140:
1.41 nicm 141: static void
1.1 nicm 142: screen_resize_x(struct screen *s, u_int sx)
143: {
144: struct grid *gd = s->grid;
145:
146: if (sx == 0)
147: fatalx("zero size");
148:
1.7 nicm 149: /*
150: * Treat resizing horizontally simply: just ensure the cursor is
151: * on-screen and change the size. Don't bother to truncate any lines -
1.38 nicm 152: * then the data should be accessible if the size is then increased.
1.7 nicm 153: *
154: * The only potential wrinkle is if UTF-8 double-width characters are
155: * left in the last column, but UTF-8 terminals should deal with this
156: * sanely.
157: */
1.1 nicm 158: if (s->cx >= sx)
159: s->cx = sx - 1;
160: gd->sx = sx;
161: }
162:
1.41 nicm 163: static void
1.1 nicm 164: screen_resize_y(struct screen *s, u_int sy)
165: {
166: struct grid *gd = s->grid;
1.4 nicm 167: u_int needed, available, oldy, i;
1.1 nicm 168:
169: if (sy == 0)
170: fatalx("zero size");
1.4 nicm 171: oldy = screen_size_y(s);
172:
1.12 nicm 173: /*
1.4 nicm 174: * When resizing:
175: *
176: * If the height is decreasing, delete lines from the bottom until
177: * hitting the cursor, then push lines from the top into the history.
1.12 nicm 178: *
1.40 nicm 179: * When increasing, pull as many lines as possible from scrolled
180: * history (not explicitly cleared from view) to the top, then fill the
181: * remaining with blanks at the bottom.
1.4 nicm 182: */
1.1 nicm 183:
184: /* Size decreasing. */
1.4 nicm 185: if (sy < oldy) {
186: needed = oldy - sy;
1.1 nicm 187:
1.4 nicm 188: /* Delete as many lines as possible from the bottom. */
189: available = oldy - 1 - s->cy;
190: if (available > 0) {
191: if (available > needed)
192: available = needed;
1.44 nicm 193: grid_view_delete_lines(gd, oldy - available, available,
194: 8);
1.1 nicm 195: }
1.4 nicm 196: needed -= available;
1.1 nicm 197:
1.4 nicm 198: /*
1.8 nicm 199: * Now just increase the history size, if possible, to take
200: * over the lines which are left. If history is off, delete
201: * lines from the top.
1.4 nicm 202: */
1.8 nicm 203: available = s->cy;
1.40 nicm 204: if (gd->flags & GRID_HISTORY) {
205: gd->hscrolled += needed;
1.8 nicm 206: gd->hsize += needed;
1.40 nicm 207: } else if (needed > 0 && available > 0) {
1.8 nicm 208: if (available > needed)
209: available = needed;
1.44 nicm 210: grid_view_delete_lines(gd, 0, available, 8);
1.8 nicm 211: }
1.4 nicm 212: s->cy -= needed;
1.12 nicm 213: }
1.1 nicm 214:
215: /* Resize line arrays. */
1.30 nicm 216: gd->linedata = xreallocarray(gd->linedata, gd->hsize + sy,
217: sizeof *gd->linedata);
1.1 nicm 218:
219: /* Size increasing. */
1.4 nicm 220: if (sy > oldy) {
221: needed = sy - oldy;
222:
1.8 nicm 223: /*
1.41 nicm 224: * Try to pull as much as possible out of scrolled history, if
225: * is is enabled.
1.8 nicm 226: */
1.40 nicm 227: available = gd->hscrolled;
1.8 nicm 228: if (gd->flags & GRID_HISTORY && available > 0) {
1.4 nicm 229: if (available > needed)
230: available = needed;
1.40 nicm 231: gd->hscrolled -= available;
1.4 nicm 232: gd->hsize -= available;
233: s->cy += available;
1.8 nicm 234: } else
235: available = 0;
1.4 nicm 236: needed -= available;
237:
238: /* Then fill the rest in with blanks. */
1.11 nicm 239: for (i = gd->hsize + sy - needed; i < gd->hsize + sy; i++)
240: memset(&gd->linedata[i], 0, sizeof gd->linedata[i]);
1.1 nicm 241: }
242:
1.4 nicm 243: /* Set the new size, and reset the scroll region. */
1.1 nicm 244: gd->sy = sy;
245: s->rupper = 0;
246: s->rlower = screen_size_y(s) - 1;
247: }
248:
249: /* Set selection. */
250: void
1.14 nicm 251: screen_set_selection(struct screen *s, u_int sx, u_int sy,
252: u_int ex, u_int ey, u_int rectflag, struct grid_cell *gc)
1.1 nicm 253: {
254: struct screen_sel *sel = &s->sel;
255:
256: memcpy(&sel->cell, gc, sizeof sel->cell);
1.13 nicm 257: sel->flag = 1;
1.45 nicm 258: sel->hidden = 0;
259:
1.14 nicm 260: sel->rectflag = rectflag;
1.13 nicm 261:
1.14 nicm 262: sel->sx = sx; sel->sy = sy;
263: sel->ex = ex; sel->ey = ey;
1.1 nicm 264: }
265:
266: /* Clear selection. */
267: void
268: screen_clear_selection(struct screen *s)
269: {
270: struct screen_sel *sel = &s->sel;
271:
272: sel->flag = 0;
1.45 nicm 273: sel->hidden = 0;
1.32 nicm 274: sel->lineflag = LINE_SEL_NONE;
1.1 nicm 275: }
276:
1.45 nicm 277: /* Hide selection. */
278: void
279: screen_hide_selection(struct screen *s)
280: {
281: struct screen_sel *sel = &s->sel;
282:
283: sel->hidden = 1;
284: }
285:
1.1 nicm 286: /* Check if cell in selection. */
287: int
288: screen_check_selection(struct screen *s, u_int px, u_int py)
289: {
290: struct screen_sel *sel = &s->sel;
1.28 nicm 291: u_int xx;
1.1 nicm 292:
1.45 nicm 293: if (!sel->flag || sel->hidden)
1.1 nicm 294: return (0);
295:
1.14 nicm 296: if (sel->rectflag) {
297: if (sel->sy < sel->ey) {
298: /* start line < end line -- downward selection. */
299: if (py < sel->sy || py > sel->ey)
300: return (0);
301: } else if (sel->sy > sel->ey) {
302: /* start line > end line -- upward selection. */
303: if (py > sel->sy || py < sel->ey)
304: return (0);
305: } else {
306: /* starting line == ending line. */
307: if (py != sel->sy)
308: return (0);
309: }
310:
311: /*
312: * Need to include the selection start row, but not the cursor
313: * row, which means the selection changes depending on which
314: * one is on the left.
315: */
316: if (sel->ex < sel->sx) {
317: /* Cursor (ex) is on the left. */
1.17 nicm 318: if (px < sel->ex)
1.14 nicm 319: return (0);
320:
321: if (px > sel->sx)
322: return (0);
323: } else {
324: /* Selection start (sx) is on the left. */
325: if (px < sel->sx)
326: return (0);
327:
1.17 nicm 328: if (px > sel->ex)
1.14 nicm 329: return (0);
330: }
331: } else {
332: /*
333: * Like emacs, keep the top-left-most character, and drop the
334: * bottom-right-most, regardless of copy direction.
335: */
336: if (sel->sy < sel->ey) {
337: /* starting line < ending line -- downward selection. */
338: if (py < sel->sy || py > sel->ey)
339: return (0);
340:
1.28 nicm 341: if (py == sel->sy && px < sel->sx)
1.29 nicm 342: return (0);
1.28 nicm 343:
344: if (py == sel->ey && px > sel->ex)
1.14 nicm 345: return (0);
346: } else if (sel->sy > sel->ey) {
347: /* starting line > ending line -- upward selection. */
348: if (py > sel->sy || py < sel->ey)
349: return (0);
350:
1.28 nicm 351: if (py == sel->ey && px < sel->ex)
352: return (0);
353:
354: if (sel->modekeys == MODEKEY_EMACS)
355: xx = sel->sx - 1;
356: else
357: xx = sel->sx;
1.46 nicm 358: if (py == sel->sy && (sel->sx == 0 || px > xx))
1.14 nicm 359: return (0);
360: } else {
361: /* starting line == ending line. */
362: if (py != sel->sy)
363: return (0);
364:
365: if (sel->ex < sel->sx) {
366: /* cursor (ex) is on the left */
1.28 nicm 367: if (sel->modekeys == MODEKEY_EMACS)
368: xx = sel->sx - 1;
369: else
370: xx = sel->sx;
371: if (px > xx || px < sel->ex)
1.14 nicm 372: return (0);
373: } else {
374: /* selection start (sx) is on the left */
375: if (px < sel->sx || px > sel->ex)
376: return (0);
377: }
378: }
1.1 nicm 379: }
380:
381: return (1);
1.43 nicm 382: }
383:
384: /* Get selected grid cell. */
385: void
386: screen_select_cell(struct screen *s, struct grid_cell *dst,
387: const struct grid_cell *src)
388: {
1.45 nicm 389: if (!s->sel.flag || s->sel.hidden)
1.43 nicm 390: return;
391:
392: memcpy(dst, &s->sel.cell, sizeof *dst);
393:
394: utf8_copy(&dst->data, &src->data);
395: dst->attr = dst->attr & ~GRID_ATTR_CHARSET;
396: dst->attr |= src->attr & GRID_ATTR_CHARSET;
397: dst->flags = src->flags;
1.24 nicm 398: }
399:
400: /* Reflow wrapped lines. */
1.42 nicm 401: static void
1.25 nicm 402: screen_reflow(struct screen *s, u_int new_x)
1.24 nicm 403: {
1.25 nicm 404: struct grid *old = s->grid;
1.26 nicm 405: u_int change;
1.24 nicm 406:
1.25 nicm 407: s->grid = grid_create(old->sx, old->sy, old->hlimit);
1.26 nicm 408:
409: change = grid_reflow(s->grid, old, new_x);
410: if (change < s->cy)
411: s->cy -= change;
412: else
413: s->cy = 0;
1.1 nicm 414: }